/* 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package cc.alcina.framework.gwt.client.gwittir.customiser;

import java.util.Comparator;

import cc.alcina.framework.common.client.util.CommonUtils;

import com.totsp.gwittir.client.ui.Renderer;

public class RendererComparator implements Comparator {
	private final Renderer renderer;

	public RendererComparator(Renderer<?, ? extends Comparable> renderer) {
		this.renderer = renderer;
	}

	public int compare(Object o1, Object o2) {
		return CommonUtils.compareWithNullMinusOne((Comparable) renderer
				.render(o1), (Comparable) renderer.render(o2));
	}
}